Convinced there will be a nice package in the nice post (8)
I believe the answer is:
sinecure
'post' is the definition.
(I know that sinecure is a type of post)
'convinced there will be a nice package in the nice' is the wordplay.
I cannot really understand how this works, but
an anagram of 'nice' is 'inec' which is within the answer.
'convinced' could be 'sure' (similar in meaning) and 'sure' is found within the remaining letters.
No letters remain.
This may be the basis of the clue (or it may be nonsense).
Can you help me to learn more?
(Other definitions for sinecure that I've seen before include "Official job with little or no work" , "position needing little effort" , "Paid job involving little or no work" , "Paid job requiring little work" , "Informally, a bobby's job" .)